The condition of a surface square with the datum plane is called ____.

A) parallelism
B) perpendicularity
C) angularity
D) flatness

Perpendicularity

A geometric tolerance that specifies the angle between two specified surfaces or features, requiring them to be exactly 90 degrees to each other.

Parallelism

The condition of being parallel; in engineering, the degree to which parts or surfaces are aligned or parallel to each other.

Angularity

Angularity is a measure of deviation or conformity to a specified angle, often critical in part and assembly to ensure proper alignment and function.